Solution : https://service.sap.com/sap/support/notes/717215 (SAP Service marketplace login required)
Key words : 
-data sharing 124 mb                            data sharing     237 mb rid pool, /os v8 migration upgrade zparm, 128 mb ------------------------------------------------------------------------buffer pool setting recommendations, affect sap systemsdb2 v8 introduces, buffer pool attribute pgfix=, ------------------------------------------------------------------------dbm1 virtual storage consumption, /os - database administration guide, returns access path information, 2 gb barin db2 v8, system parameter bind reason
Related Notes : 
       
| 1452370 | DB2-z/OS:v10: Release of DB2 10 for SAP Components | 
| 1032273 | DB2-z/OS: Configuring DB2 V9 | 
| 886266 | DB2-z/OS: DB2 system parameter XLKUPDLT | 
| 728743 | Series z: Release of DB2 V8 for SAP Components |